Feudalism characterized the social system of medieval Europe.

There are a lot of fragrant grass growing in this park.

A person who committed the crime of public urination was arrested in the park.

He is a highly respected judge.

He is an expert in public law.

This problem cannot be solved unless both sides cooperate.

My younger brother caught smallpox.

This radio is emitting music.

As a way of repaying the kindness of me helping him, he helped me repair my house.

He wrote a dazibao to protest against the government.